[Coco] [coco] video signal generation
rga24 at cantab.net
Fri Jan 5 05:13:36 EST 2007
Just one thing I'd check. Are you terminating the video signals properly?
Your filter might be acting partly as a terminator, and without termination
the rise and fall times could be longer.
On 1/5/07, RJRTTY at aol.com <RJRTTY at aol.com> wrote:
> I have been struggling with a problem with my converter for a while
> and I need some information.
> Does anybody know the details of how the GIME generates a
> RGB video signal? The problem I am having is that while 80 col
> text on the green channel is clear and sharp, 80 col text on the red
> some video degradation and 80 col text on the blue channel is completely
> What I am thinking is that the GIME generates the green channel first,
> red channel second and the blue channel last. Is this correct?
> strange thing is that 80 col text in any color combination that has even
> little green in it shows up well but if you look at 80 col. text using
> red or blue as the foreground or backround you get a wierd kind of video
> I already have a solution. If a low pass filter is placed in the input
> the 80 col text shows up well in all color combinations. In other words
> to DECREASE the bandwidth of the converter in order to get acceptable
> results. It seems that the quality of the video signal coming out of
> GIME in the coco3 is only slightly better than the old monitors could
> and the high bandwidth of my converter is just too much for the signal
> showing it "warts and all".
> I don't know about the rest of you but purposely degrading the converter
> approximate the perfomance of the old monitors just seems wrong to
> me. The
> image does soften a tiny bit with the filters but not enough to notice if
> were not already looking for it or directly comparing it to
> an unfiltered
> Does anybody know what is going on with the conversion process in the
> GIME to cause this?
> Coco mailing list
> Coco at maltedmedia.com
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